Mathematics – Logic
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198..163f&link_type=abstract
Astrophysical Journal, vol. 198, May 15, 1975, pt. 1, p. 163-182. Research supported by the Scientific and Technical Research C
Mathematics
Logic
292
Gamma Rays, Sas, Spaceborne Telescopes, X Ray Telescopes, Cosmic Rays, Crab Nebula, Diffuse Radiation, Galactic Radiation, Galactic Structure, Pulsars, Supernova Remnants
Scientific paper
Data are reported which were obtained with a high-energy (exceeding 35 Mev) gamma-ray telescope flown on the second Small Astronomy Satellite (SAS-2). The high-energy galactic gamma radiation is observed to dominate over the general diffuse radiation along the entire galactic plane, and its longitudinal and latitudinal distributions appear to be generally correlated with galactic structural features, particularly with arm segments. Principally on the basis of its angular distribution and magnitude, it is suggested that this radiation results primarily from cosmic-ray interactions with interstellar matter. A uniform celestial gamma radiation appears to have been detected; the form of its differential spectrum over the energy range from about 35 to 170 MeV is obtained, and a cosmological origin is suggested for this radiation. In addition to the general galactic emission, high-energy gamma radiation was detected from the Crab Nebula, Vela X, a general region toward the galactic center, and a region located a few degrees north of the galactic plane. Upper limits to the high-energy gamma ray fluxes are set for a number of localized sources.
Bignami Giovanni F.
Fichtel Carl E.
Hartman Robert C.
Kniffen Donald A.
Ogelman Hakki
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